Get default -fms-compatibility-version from cl.exe's version

-fms-compatibility-version was defaulting to 18 (VS 2013), which is a pain if your environment is pointing to version 19 (VS 2015) libraries.

If cl.exe can be found, this patch uses its version number as the default instead. It re-uses the existing code to find the Visual Studio binaries folder and WinAPI methods to check its version. You can still explicitly specify a compatibility version on the command line. If you don't have cl.exe, this should be a no-op and you'll get the old default of 18.

This affected the tests, which assumed that if you didn't specific a version, that it would default to 18, but this won't be true for all machines. So a couple test cases had to be eliminated and a couple others had to be tweaked to allow for various outputs.

Addresses: https://llvm.org/bugs/show_bug.cgi?id=27215

Differential Revision: http://reviews.llvm.org/D20136

llvm-svn: 269515

clang/include/clang/Driver/ToolChain.h

@@ -11,6 +11,7 @@
 #define LLVM_CLANG_DRIVER_TOOLCHAIN_H
 
 #include "clang/Basic/Sanitizers.h"
+#include "clang/Basic/VersionTuple.h"
 #include "clang/Driver/Action.h"
 #include "clang/Driver/Multilib.h"
 #include "clang/Driver/Types.h"
@@ -422,6 +423,10 @@ public:
 
   /// \brief Return sanitizers which are enabled by default.
   virtual SanitizerMask getDefaultSanitizers() const { return 0; }
+
+  /// \brief On Windows, returns the version of cl.exe.  On other platforms,
+  /// returns an empty VersionTuple.
+  virtual VersionTuple getMSVCVersionFromExe() const { return VersionTuple(); }
 };
 
 } // end namespace driver

clang/lib/Driver/MSVCToolChain.cpp

@@ -19,6 +19,7 @@
 #include "llvm/Config/llvm-config.h"
 #include "llvm/Option/Arg.h"
 #include "llvm/Option/ArgList.h"
+#include "llvm/Support/ConvertUTF.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/FileSystem.h"
 #include "llvm/Support/Process.h"
@@ -37,6 +38,8 @@
     #define NOMINMAX
   #endif
   #include <windows.h>
+
+  #pragma comment(lib, "version.lib")
 #endif
 
 using namespace clang::driver;
@@ -457,6 +460,45 @@ bool MSVCToolChain::getVisualStudioBinariesFolder(const char *clangProgramPath,
   return true;
 }
 
+VersionTuple MSVCToolChain::getMSVCVersionFromExe() const {
+  VersionTuple Version;
+#ifdef USE_WIN32
+  std::string BinPath;
+  if (!getVisualStudioBinariesFolder("", BinPath))
+    return Version;
+  SmallString<128> ClExe = BinPath;
+  llvm::sys::path::append(ClExe, "cl.exe");
+
+  std::wstring ClExeWide;
+  if (!llvm::ConvertUTF8toWide(ClExe.c_str(), ClExeWide))
+    return Version;
+
+  const DWORD VersionSize = ::GetFileVersionInfoSizeW(ClExeWide.c_str(),
+                                                      nullptr);
+  if (VersionSize == 0)
+    return Version;
+
+  SmallVector<uint8_t, 4 * 1024> VersionBlock(VersionSize);
+  if (!::GetFileVersionInfoW(ClExeWide.c_str(), 0, VersionSize,
+                             VersionBlock.data()))
+    return Version;
+
+  VS_FIXEDFILEINFO *FileInfo = nullptr;
+  UINT FileInfoSize = 0;
+  if (!::VerQueryValueW(VersionBlock.data(), L"\\",
+                        reinterpret_cast<LPVOID *>(&FileInfo), &FileInfoSize) ||
+      FileInfoSize < sizeof(*FileInfo))
+    return Version;
+
+  const unsigned Major = (FileInfo->dwFileVersionMS >> 16) & 0xFFFF;
+  const unsigned Minor = (FileInfo->dwFileVersionMS      ) & 0xFFFF;
+  const unsigned Micro = (FileInfo->dwFileVersionLS >> 16) & 0xFFFF;
+
+  Version = VersionTuple(Major, Minor, Micro);
+#endif
+  return Version;
+}
+
 // Get Visual Studio installation directory.
 bool MSVCToolChain::getVisualStudioInstallDir(std::string &path) const {
   // First check the environment variables that vsvars32.bat sets.
@@ -618,7 +660,7 @@ MSVCToolChain::ComputeEffectiveClangTriple(const ArgList &Args,
       ToolChain::ComputeEffectiveClangTriple(Args, InputType);
   llvm::Triple Triple(TripleStr);
   VersionTuple MSVT =
-      tools::visualstudio::getMSVCVersion(/*D=*/nullptr, Triple, Args,
+      tools::visualstudio::getMSVCVersion(/*D=*/nullptr, *this, Triple, Args,
                                           /*IsWindowsMSVC=*/true);
   if (MSVT.empty())
     return TripleStr;

clang/lib/Driver/ToolChains.h

@@ -1028,6 +1028,7 @@ public:
   bool getVisualStudioInstallDir(std::string &path) const;
   bool getVisualStudioBinariesFolder(const char *clangProgramPath,
                                      std::string &path) const;
+  VersionTuple getMSVCVersionFromExe() const override;
 
   std::string ComputeEffectiveClangTriple(const llvm::opt::ArgList &Args,
                                           types::ID InputType) const override;

clang/lib/Driver/Tools.cpp

@@ -3293,7 +3293,7 @@ static void appendUserToPath(SmallVectorImpl<char> &Result) {
   Result.append(UID.begin(), UID.end());
 }
 
-VersionTuple visualstudio::getMSVCVersion(const Driver *D,
+VersionTuple visualstudio::getMSVCVersion(const Driver *D, const ToolChain &TC,
                                           const llvm::Triple &Triple,
                                           const llvm::opt::ArgList &Args,
                                           bool IsWindowsMSVC) {
@@ -3335,8 +3335,14 @@ VersionTuple visualstudio::getMSVCVersion(const Driver *D,
     if (Major || Minor || Micro)
       return VersionTuple(Major, Minor, Micro);
 
-    // FIXME: Consider bumping this to 19 (MSVC2015) soon.
-    return VersionTuple(18);
+    if (IsWindowsMSVC) {
+      VersionTuple MSVT = TC.getMSVCVersionFromExe();
+      if (!MSVT.empty())
+        return MSVT;
+
+      // FIXME: Consider bumping this to 19 (MSVC2015) soon.
+      return VersionTuple(18);
+    }
   }
   return VersionTuple();
 }
@@ -5226,7 +5232,7 @@ void Clang::ConstructJob(Compilation &C, const JobAction &JA,
 
   // -fms-compatibility-version=18.00 is default.
   VersionTuple MSVT = visualstudio::getMSVCVersion(
-      &D, getToolChain().getTriple(), Args, IsWindowsMSVC);
+      &D, getToolChain(), getToolChain().getTriple(), Args, IsWindowsMSVC);
   if (!MSVT.empty())
     CmdArgs.push_back(
         Args.MakeArgString("-fms-compatibility-version=" + MSVT.getAsString()));

clang/lib/Driver/Tools.h

@@ -682,7 +682,8 @@ public:
 
 /// Visual studio tools.
 namespace visualstudio {
-VersionTuple getMSVCVersion(const Driver *D, const llvm::Triple &Triple,
+VersionTuple getMSVCVersion(const Driver *D, const ToolChain &TC,
+                            const llvm::Triple &Triple,
                             const llvm::opt::ArgList &Args, bool IsWindowsMSVC);
 
 class LLVM_LIBRARY_VISIBILITY Linker : public Tool {

clang/test/Driver/cl-options.c

@@ -387,7 +387,7 @@
 // RTTI-NOT: "-fno-rtti"
 
 // thread safe statics are off for versions < 19.
-// RUN: %clang_cl /c -### -- %s 2>&1 | FileCheck -check-prefix=NoThreadSafeStatics %s
+// RUN: %clang_cl /c -### -fms-compatibility-version=18 -- %s 2>&1 | FileCheck -check-prefix=NoThreadSafeStatics %s
 // RUN: %clang_cl /Zc:threadSafeInit /Zc:threadSafeInit- /c -### -- %s 2>&1 | FileCheck -check-prefix=NoThreadSafeStatics %s
 // NoThreadSafeStatics: "-fno-threadsafe-statics"
 

clang/test/Driver/msc-version.c

@@ -1,14 +1,3 @@
-//
-// Verify defaults
-//
-
-// RUN: %clang -target i686-windows -fms-compatibility -dM -E - </dev/null -o - | FileCheck %s -check-prefix CHECK-NO-MSC-VERSION
-
-// CHECK-NO-MSC-VERSION: _MSC_BUILD 1
-// CHECK-NO-MSC-VERSION: _MSC_FULL_VER 180000000
-// CHECK-NO-MSC-VERSION: _MSC_VER 1800
-
-
 //
 // Verify -fms-compatibility-version parsing
 //

clang/test/Driver/msvc-triple.c

@@ -1,9 +1,7 @@
-// RUN: %clang -target i686-pc-windows-msvc   -S -emit-llvm %s -o - | FileCheck %s --check-prefix=DEFAULT
 // RUN: %clang -target i686-pc-windows-msvc19 -S -emit-llvm %s -o - | FileCheck %s --check-prefix=TARGET-19
 // RUN: %clang -target i686-pc-windows-msvc   -S -emit-llvm %s -o - -fms-compatibility-version=19 | FileCheck %s --check-prefix=OVERRIDE-19
 // RUN: %clang -target i686-pc-windows-msvc-elf -S -emit-llvm %s -o - | FileCheck %s --check-prefix=ELF-DEFAULT
 
-// DEFAULT:     target triple = "i686-pc-windows-msvc18.0.0"
 // TARGET-19:   target triple = "i686-pc-windows-msvc19.0.0"
 // OVERRIDE-19: target triple = "i686-pc-windows-msvc19.0.0"
-// ELF-DEFAULT: target triple = "i686-pc-windows-msvc18.0.0-elf"
+// ELF-DEFAULT: target triple = "i686-pc-windows-msvc{{.*}}-elf"

clang/test/Misc/diag-format.c

@@ -37,7 +37,7 @@
 // DEFAULT: {{.*}}:36:8: warning: extra tokens at end of #endif directive [-Wextra-tokens]
 // MSVC2010: {{.*}}(36,7) : warning: extra tokens at end of #endif directive [-Wextra-tokens]
 // MSVC2013: {{.*}}(36,8) : warning: extra tokens at end of #endif directive [-Wextra-tokens]
-// MSVC: {{.*}}(36,8) : warning: extra tokens at end of #endif directive [-Wextra-tokens]
+// MSVC: {{.*}}(36,8){{ ?}}: warning: extra tokens at end of #endif directive [-Wextra-tokens]
 // MSVC2015: {{.*}}(36,8): warning: extra tokens at end of #endif directive [-Wextra-tokens]
 // VI: {{.*}} +36:8: warning: extra tokens at end of #endif directive [-Wextra-tokens]
 // MSVC2015_ORIG: {{.*}}(36): warning: extra tokens at end of #endif directive [-Wextra-tokens]